Cobalt lithium phosphate positive electrode material and preparation method therefor
A positive electrode material, lithium cobalt phosphate technology, applied in the field of lithium-ion batteries, can solve the problems of electrolyte decomposition, cycle performance to be improved, low electronic conductivity of lithium cobalt phosphate materials, etc., to achieve full contact, easy operation, and increase specific surface area and the effect of conductivity
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Embodiment 1
[0023] Li was weighed at the molar ratio Li:Co:P:B=1:1:0.02:0.98 2 CO 3 , Co(NO 3 ) 2 •6H 2 O and NH 4 h 2 PO 4 and H 3 BO 3 Add 5ml of ethanol to the ball mill tank, mix it with ball mill and dry it in vacuum, then place it in a muffle furnace and burn it at 350°C for 5 hours under nitrogen atmosphere to obtain the mixture I;
[0024] Then mix the above-mentioned mixture I with an appropriate carbon source and add 5ml of ethanol in the ball mill tank to carry out the second ball mill and then vacuum-dry to obtain the mixture II; 5%, the same below)
[0025] Then, the above mixture II was put into a muffle furnace at 750°C and burned for 8 hours under nitrogen atmosphere to obtain the boron-doped cobalt lithium phosphate cathode material LiCo(P 1-0.02 B 0.02 o 4-δ ) / C.
Embodiment 2
[0027] Li was weighed at the molar ratio Li:Co:P:B=1:1:0.05:0.95 2 CO 3 , Co(NO 3 ) 2 ·6H 2 O and NH 4 h 2 PO 4 and H 3 BO 3 Add 8ml of ethanol to the ball mill jar, ball mill, mix and dry in vacuum, then place in a muffle furnace and burn at 350°C for 5 hours under an inert atmosphere to obtain mixture I;
[0028] Then mix the above-mentioned mixture I with an appropriate carbon source and add 8ml of ethanol to the ball mill tank for secondary ball milling and vacuum drying to obtain mixture II;
[0029] Then, the above mixture II was put into a muffle furnace at 650 ° C under an inert atmosphere and burned for 16 hours to obtain the boron-doped cobalt lithium phosphate cathode material LiCo(P 1-0.05 B 0.05 o 4-δ ) / C.
Embodiment 3
[0031] Weigh Li respectively at the molar ratio Li: Co: P: B = 1: 1: 0.1: 0.9 2 CO 3 , Co(NO 3 ) 2 •6H 2 O and NH 4 h 2 PO 4 and H 3 BO 3 Add 6ml of ethanol to the ball mill tank, mix with ball mill and dry it in vacuum, then place it in a muffle furnace and burn it at 350°C for 5 hours under an inert atmosphere to obtain the mixture I;
[0032] Then mix the above-mentioned mixture I with an appropriate carbon source and add 6ml of ethanol to the ball mill jar for second ball milling and vacuum drying to obtain mixture II;
[0033] Then, the above mixture II was put into a muffle furnace at 700°C under an inert atmosphere and burned for 12 hours to obtain the boron-doped cobalt lithium phosphate cathode material LiCo(P 1-0。1 B 0.1 o 4-δ ) / C.
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